Live where you thrive: Joint evolution of habitat choice and local adaptation facilitates specialization and promotes diversity

Ravigne V, Dieckmann U, & Olivieri I (2009). Live where you thrive: Joint evolution of habitat choice and local adaptation facilitates specialization and promotes diversity. The American Naturalist 174 (4): E141-E169. DOI:10.1086/605369.

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Abstract

We derive a comprehensive overview of specialization evolution based on analytical results and numerial illustrations. We study the separate and joint evolution of two critical facets of specialization local adaptation and habitat choiceunder different life cycles, modes of density regulation, vaiane-covariance structures, and trade-off strengths. A particular feature of our analysis is the investgation of arbitrary trade-off functions. We find that localadaptation evolution qualitatively change the outcome of habitat-choice evolution under a wide range of conditions. In addition, habita-choic evolution qualitatively and invariably changes the outcomes of local-adaptation evolution whenever rade-offs are weak. Even weak trade-offs, which favor generalists when habitat choice is fixed, selet for specialists once local adaptation and habitat choice are both allowed to evolve. Unles trappedby maladaptive genetic constraints, joint evolution of local adaptation and habitat choice in the moels analyzed here thus always leads to specialists, independent of life cycle, density regulation, ad trade-off strength, thus raising the bar for evolutionarily sound explanations of genealism. Whethr a single specialist or two specialists evolve depends on the life cycle and the mode of density reulation. Finally, we explain why the gradual evolutionary emergence of coexisting specialists requirs more restrictive conditions than does their evolutionarily stable maintenance.

Item Type: Article
Uncontrolled Keywords: Trade-off; Soft selection; Hard selection; Protected polymorphism; Adaptive dynamics; Heterogeneous evironment
Research Programs: Evolution and Ecology (EEP)
Bibliographic Reference: The American Naturalist; 174(4):E141-E169 (October 2009)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:41
Last Modified: 07 Sep 2016 11:54
URI: http://pure.iiasa.ac.at/8784

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